Circular small-size low-pressure-drop closed check valve

Abstract

The utility model discloses a round small-size low-pressure-drop check closed valve which comprises a valve body, a blade and a shaft, the blade is installed on the valve body through the shaft, a deep groove ball bearing is arranged between the shaft and the valve body, the shaft and the blade are connected through a self-adaptive adjusting block, and a heavy hammer is fixed at the outer end of the shaft through a fastener. The utility model has the beneficial effects of convenience in use, quickness in installation, simplicity in disassembly and easiness in maintenance. The valve is small in resistance, low in pressure drop, stable in overall action, compact in structure, good in reverse sealing performance and high in shock resistance when gas is exhausted; the parallelism between the blades and the flatness of the blades can be effectively guaranteed; soft contact is formed between the sealing piece and the blade, so that the overall sealing effect of the closed valve is effectively ensured; the pressure drop and the resistance coefficient can be effectively reduced through the flow guide block at the bottom of the valve seat, and internal gas circulation can be effectively accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation valves, in particular to a circular small-size low-pressure-drop check and airtight valve. Background Art

[0002] A check valve is a key valve for isolating accidental reverse airflows in the nuclear island ventilation system of a nuclear power plant. When the fan is operating, airflows form a positive pressure through the valve body, and the valve opens. When the fan stops, the valve automatically closes and prevents external airflows from flowing back.

[0003] However, in the process of implementing the technical solution of the utility model in the embodiments of the present application by the applicant, it is found that the above technology has at least the following technical problems:

[0004] 1. There are defects in the sealing system. The blades and the valve seat form a hard seal, and vibrations caused by transportation, operation, etc. may cause the blades to displace and loosen, resulting in a poor sealing effect;

[0005] 2. The valve seat and the blades occupy a large flow area. At a certain gas flow rate, the pressure drop before and after the valve is large, affecting the gas discharge at the lower part;

[0006] 3. The valve needs to be slightly opened under a pressure difference of 50 Pa between the lower part and the upper part, and there is a sealing requirement under a pressure difference of 250 Pa between the upper part and the lower part. Since the diameter of the circular valve is small and the windward area of the blades is small, these two index requirements are a pair of contradictions in terms of technical implementation, and it is extremely difficult to debug the valve during the test adjustment. Content of the Utility Model

[0007] The embodiments of the present application provide a circular small-size low-pressure-drop check and airtight valve, which is convenient to use, quick to install, simple to disassemble, and easy to maintain. When discharging gas, the valve has a small resistance and a low pressure drop, the overall action is stable, the structure is compact, the reverse airtight performance is good, and the earthquake resistance ability is strong.

[0008] The embodiments of the present application provide a circular small-size low-pressure-drop check and airtight valve, including: a valve body, blades, and a shaft. The blades are installed on the valve body through the shaft. A deep groove ball bearing is arranged between the shaft and the valve body. The shaft and the blades are connected through an adaptive adjustment block. A weight is fixed to the outer end of the shaft through a fastener.

[0009] The valve body includes: a valve frame, a valve seat, and a seal. The valve seat and the valve frame are fixedly connected by welding. After welding, the valve body and the valve seat are processed. The processing contents include: a shaft hole, a sealing surface, a sealing groove, and a flow guide. The seal is made of ethylene propylene diene monomer (EPDM). A sealing groove matching with the seal is arranged on the valve seat. The seal is arranged in the sealing groove by embedding.

[0010] The described seals are respectively arranged on the outer ring and the inner ring of the valve seat. The seals cooperate with the blades. A flow guide block is arranged at the bottom of the valve seat, and the flow guide block is integrally provided with the valve seat.

[0011] The described adaptive adjustment block includes a shaft end connecting plate, a blade connecting plate, a slotted nut and a bolt with a hole. The shaft end connecting plate and the shaft are connected by a set screw. The blade connecting plate and the blade are connected by a fastener. The shaft end connecting plate and the blade connecting plate are connected by a bolt with a hole and a slotted nut.

[0012] The shaft end connecting plate and the blade connecting plate are connected by a bolt with a hole and a slotted nut. There are gaps between the shaft end connecting plate and the blade connecting plate, and between the blade connecting plate and the bolt with a hole. The slotted nut is limited by an opening pin.

[0013] The described valve body is circular as a whole. The blades are divided into a left blade and a right blade. The shaft is divided into two sections and is on the same straight line and is installed on the valve body. The adaptive adjustment blocks are respectively arranged on the two sections of the shaft. The weight on the shaft fixed to the left blade is located on the right side of the shaft, and the weight on the shaft fixed to the right blade is located on the left side of the shaft.

[0014] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: The utility model is convenient to use, quick to install, simple to disassemble and easy to maintain. When the valve discharges gas, the resistance is small, the pressure drop is low, the overall movement is stable, the structure is compact, the reverse sealing performance is good, and the seismic resistance is strong.

[0015] The valve body adopts the form of welding first and then machining, which can effectively ensure the parallelism between the blades and the flatness of itself. The seal is arranged in the seal groove on the valve seat by embedding. A soft contact is formed between the seal and the blade. The greater the external pressure on the valve body, the tighter the seal is pressed by the blade, effectively ensuring the overall sealing effect of the closed valve. The flow guide block at the bottom of the valve seat can effectively reduce the pressure drop and resistance coefficient, and can effectively accelerate the internal gas flow.

[0016] The position of the blade can be adjusted back and forth through the adaptive adjustment block, so that the blade can better cooperate with the valve body, ensure that the blade can better fit the seal. The adaptive adjustment block and the blade do not occupy the internal space, and the internal gas flow can be effectively ensured when the blade is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0018] Figure 2 It is a transverse sectional view of the valve body in the utility model;

[0019] Figure 3 This is a schematic structural view of the adaptive adjustment block in the present utility model;

[0020] Figure 4 This is a transverse sectional view of the present utility model. Specific embodiments

[0021] In order to better understand the above technical solution, the following will describe the above technical solution in detail in conjunction with the accompanying drawings of the specification and specific embodiments. Embodiment

[0022] A circular small-sized low-pressure-drop check and airtight valve includes: a valve body 1, a vane 2, and a shaft 3. The vane 2 is installed on the valve body 1 through the shaft 3. A deep groove ball bearing is provided between the shaft 3 and the valve body 1. The shaft 3 is connected to the vane 2 through an adaptive adjustment block 4. A weight 5 is fixed to the outer end of the shaft 3 through a fastener.

[0023] The technical solution in the above embodiments of the present application has at least the following technical effects or advantages:

[0024] This valve is horizontally installed. When the internal air flow passes through the valve body 1 from bottom to top, the vane 2 rotates upward and opens under the gravity of the weight 5 and the air flow pressure. When the internal air flow passes through the valve body 1 from top to bottom, the vane 2 and the valve body 1 form a sealed main body and remain airtight under the pressure of the external air flow. The overall use is convenient, the installation is fast, the disassembly is simple, and the maintenance is easy; the valve has a small resistance and low pressure drop during gas discharge, the overall movement is stable, the structure is compact, the reverse airtight performance is good, and the seismic resistance is strong. Embodiment

[0025] A circular small-sized low-pressure-drop check and airtight valve, the valve body 1 includes: a valve frame 11, a valve seat 12, and a seal 13. The valve seat 12 and the valve frame 11 are fixedly connected by welding. After welding, the valve body 1 and the valve seat 12 are processed. The processing contents include: a shaft 3 hole, a sealing surface, a sealing groove, and a flow guide. The seal 13 is made of ethylene propylene diene monomer rubber. A sealing groove matching with the seal 13 is provided on the valve seat 12. The seal 13 is arranged in the sealing groove by embedding. The seal 13 is respectively arranged on the outer ring and the inner ring of the valve seat 12. The seal 13 cooperates with the vane 2. A flow guide block is provided at the bottom of the valve seat 12. The flow guide block and the valve seat 12 are integrally arranged.

[0026] The technical solution in the above embodiments of the present application has at least the following technical effects or advantages:

[0027] The valve body 1 is in the form of first welding and then machining, which can effectively ensure the parallelism between the blades 2 and the flatness of itself; the seal 13 is arranged in the seal groove on the valve seat 12 by embedding, and a soft contact is formed between the seal 13 and the blade 2. The greater the external pressure on the valve body 1, the tighter the seal 13 is pressed by the blade 2, effectively ensuring the overall sealing effect of the closed valve; the flow guide block at the bottom of the valve seat 12 can effectively reduce the pressure drop and resistance coefficient, and can effectively accelerate the internal gas flow. Embodiment

[0028] A circular small-size low-pressure-drop check and closed valve, the adaptive adjustment block 4 includes a shaft-end connecting plate 41, a blade connecting plate 42, a slotted nut 43 and a bolt with holes 44. The shaft-end connecting plate 41 and the shaft 3 are connected by a set screw, the blade connecting plate 42 and the blade 2 are connected by a fastener, and the shaft-end connecting plate 41 and the blade connecting plate 42 are connected by the bolt with holes 44 and the slotted nut 43.

[0029] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0030] The position of the blade 2 can be adjusted back and forth through the adaptive adjustment block 4, so that the blade 2 can better cooperate with the valve body 1, ensure that the blade 2 can better fit the seal 13, the adaptive adjustment block 4 and the blade 2 do not occupy the internal space, and the internal gas flow can be effectively ensured when the blade 2 is opened. Embodiment

[0031] A circular small-size low-pressure-drop check and closed valve, the shaft-end connecting plate 41 and the blade connecting plate 42 are connected by the bolt with holes 44 and the slotted nut 43, there are gaps between the shaft-end connecting plate 41 and the blade connecting plate 42 and between the blade connecting plate 42 and the bolt with holes 44, the slotted nut 43 is limited by an opening pin, the valve body 1 is generally circular, the blade 2 is divided into a left blade and a right blade, the shaft 3 is divided into two sections and is on the same straight line and installed on the valve body 1, and the adaptive adjustment blocks 4 are respectively arranged on the two sections of the shaft 3. The weight 5 on the shaft 3 fixed to the left blade is located on the right side of the shaft 3, and the weight 5 on the shaft 3 fixed to the right blade is located on the left side of the shaft 3.

[0032] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0033] The shaft 3 is a two-section shaft 3, which is respectively fixed to the left blade and the right blade. The center of gravity of the weight 5 is located on the other side of the blade 2, which can effectively use the gravity of the weight 5 to reset the blade 2. Affected by its own weight and the gravity hammer, the blade 2 can automatically fit on the seal 13.

[0034] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present utility model.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A circular small-sized low-pressure-drop check valve, comprising: Valve body, vane and shaft, characterized in that the vane is mounted on the valve body through the shaft, a deep groove ball bearing is arranged between the shaft and the valve body, the shaft and the vane are connected through an adaptive adjustment block, and a weight is fixed to the outer end of the shaft through a fastener.

2. The circular small-size low-pressure-drop check and airtight valve according to claim 1, characterized in that, The valve body includes: a valve frame, a valve seat and a seal. The valve seat and the valve frame are fixedly connected by welding. After welding, the valve body and the valve seat are machined. The machining contents include: a shaft hole, a sealing surface, a sealing groove and a diversion. The seal is made of ethylene propylene diene monomer (EPDM). A sealing groove matching with the seal is arranged on the valve seat, and the seal is arranged in the sealing groove by embedding.

3. A circular small-size low-pressure-drop check and airtight valve according to claim 2, characterized in that The seals are respectively arranged on the outer ring and the inner ring of the valve seat. The seals cooperate with the vane. A diversion block is arranged at the bottom of the valve seat, and the diversion block is integrally formed with the valve seat.

4. A circular small-sized low-pressure-drop check and airtight valve according to claim 1, characterized in that, The adaptive adjustment block includes a shaft end connecting plate, a vane connecting plate, a slotted nut and a bolt with a hole. The shaft end connecting plate and the shaft are connected by a set screw. The vane connecting plate and the vane are connected by a fastener. The shaft end connecting plate and the vane connecting plate are connected by a bolt with a hole and a slotted nut.

5. The circular small-sized low-pressure-drop check and airtight valve according to claim 1, characterized in that, The shaft end connecting plate and the vane connecting plate are connected by a bolt with a hole and a slotted nut. There are gaps between the shaft end connecting plate and the vane connecting plate and between the vane connecting plate and the bolt with a hole. The slotted nut is limited by an open pin.

6. A circular small-sized low-pressure-drop check and airtight valve according to claim 1, characterized in that, The valve body is integrally circular. The vane is divided into a left vane and a right vane. The shaft is divided into two sections and is on the same straight line and is mounted on the valve body. The adaptive adjustment blocks are respectively arranged on the two sections of the shaft. The weight on the shaft fixed to the left vane is located on the right side of the shaft, and the weight on the shaft fixed to the right vane is located on the left side of the shaft.

Images